STRETCHING OF POLYMERIC FILMS

摘要

Polymeric films such as films of polyethylene terephtalate, are stretched with low "neck-in" over a short span defined by two counter-rotating rolls (26,27), the first of which (26) has a matt surface, i.e.a. mattness represented by a Centre Line Average. (Brit.Standard 1134; 1950) of at least 5 microinch to prevent sticking at the stretching temperatures.